How quickly must each Primary Scheduling Entity with title to an interchange transaction arrange personnel for notification of changes?

The correct answer reflects the requirement that each Primary Scheduling Entity must arrange personnel for the notification of changes to an interchange transaction immediately. This urgency is crucial in the electric power sector because timely communication and coordination of changes can significantly impact the reliability and efficiency of the grid, preventing potential disruptions or outages.

Immediate notification ensures that all relevant stakeholders are informed in real-time, allowing for swift adjustments as necessary to maintain system stability and adhere to operational standards. In scenarios involving energy transactions, the ability to react quickly to changes can help mitigate risks associated with energy delivery, generation, and consumption, thereby supporting overall grid reliability.

Other response options do not align with this immediate need for action, as they suggest longer time frames that may not suffice in maintaining the necessary responsiveness required in the industry.